查看文章

An intercluster reaction between Au₂₅(PET)₁₈ and Ir₉(PET)₆ producing the alloy cluster, Au₂₂Ir₃(PET)₁₈ exclusively, is demonstrated where the ligand PET is 2-phenylethanethiol. Typical reactions of this kind between Au₂₅(PET)₁₈ and Ag₂₅(SR)₁₈, and other clusters reported previously, produce mixed cluster products. The cluster composition was confirmed by detailed high-resolution electrospray ionization mass spectrometry (ESI MS) and other spectroscopic techniques. This is the first example of Ir metal incorporation in a monolayer-protected noble metal cluster. The formation of a single product was confirmed by thin layer chromatography (TLC). Density functional theory (DFT) calculations suggest that the most favorable geometry of the Au₂₂Ir₃(PET)₁₈ cluster is one wherein the three Ir atoms are arranged triangularly with one Ir atom at the icosahedral core and the other two on the icosahedral shell …